Multi Row Tables / Combine information where row is equal?

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Lets say I run simulations with different parameters A,B and for each of the A and B values i simulate another set of parameters x,y
Parset1=['A';'A';'B';'B'];
Parset2=['x';'y';'x';'y'];
And my simulation maybe produces numbers of false positives from the simulation:
FalsePositives=[3;5;6;9];
table(Parset1,Parset2,FalsePositives)
ans = 4×3 table
Parset1 Parset2 FalsePositives _______ _______ ______________ A x 3 A y 5 B x 6 B y 9
And now maybe i want to get the total number of false positives for all simulations with same Parset1:
CumulativeFalsePositivesbyParset1=[8;8;15;15];
table(Parset1,Parset2,FalsePositives,CumulativeFalsePositivesbyParset1)
ans = 4×4 table
Parset1 Parset2 FalsePositives CumulativeFalsePositivesbyParset1 _______ _______ ______________ _________________________________ A x 3 8 A y 5 8 B x 6 15 B y 9 15
Is there an easy way to do this with code??
Maybe even cleverer, can I make tables like below?
Parset1 | Parset2 | FalsePositives | CumulativeFalsePositives
-------------------------------------------------------------------------------------------------------
| x | 3 |
A --------------------------------------------------- 8
| y | 5 |
-------------------------------------------------------------------------------------------------------
| x | 6 |
B --------------------------------------------------- 15
| y | 9 |
-------------------------------------------------------------------------------------------------------

Accepted Answer

Eric Sofen
Eric Sofen on 3 Dec 2021
You can use varfun to apply the cumsum function to each group defined by Parset1.
Parset1=['A';'A';'B';'B'];
Parset2=['x';'y';'x';'y'];
FalsePositives=[3;5;6;9];
t = table(Parset1,Parset2,FalsePositives);
tc = varfun(@cumsum,t,"GroupingVariables","Parset1","InputVariables","FalsePositives")
% all in one table - copy over the original FalsePositives data
tc.FalsePositives = t.FalsePositives

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